Séparer les milliers des nombres en JS

function lisibilite_nombre(nbr)
{
		var nombre = ''+nbr;
		var retour = '';
		var count=0;
		for(var i=nombre.length-1 ; i>=0 ; i--)
		{
			if(count!=0 && count % 3 == 0)
				retour = nombre[i]+' '+retour ;
			else
				retour = nombre[i]+retour ;
			count++;
		}
		alert('nb : '+nbr+' => '+retour);
		return retour;
}

<?php

$now = time();
$start = mktime(0, 0, 0, 1, 24, 2007);
$carbonsaving =((($now - $start) * 0.0058774) + 130000);
$format = round($carbonsaving, 3);
// in this example
// $now = a unix timestamp of this very second
// $start is the date that you want the counter to start from sent over //as a unix timestamp
// $carbonsaving is the calculation that you want to perform to get //your base figure
// i.e. total saving = ((date now - start date)* growth rate) + base rate
// this gives us the starting saving all that needs to be done is increment it with javascript
?>

<script type="text/javascript">



// we need to import our server side variable into javascript to let it increment live

var car = <?php print($format); ?>;
var rou

function incs()
{
car = car + 10.46;
rou = Math.round(car*100)/100
document.getElementById("carb").innerHTML=rou;
}
// what function incs does is take car and adds 0.01 to it
//rou rounds the figure to 2 dp
//the document.getElementById("carb") can refer to a <p> tag //<span> or whatever and just says with .innerHTML=rou; that the //value between the results of rou
//hope this helps
//Nicholas King
//ecotricity
</script>